DSR-based Test Procedures and Specification Guidelines for Grading PG58-XX and PG64S-XX Asphalt Binders in the State of Kansas

Application of the MSCR test in grading and grade adjustment of modified asphalt binders has gained popularity in recent years. Two separate parameters are determined from the MSCR test, namely: non-recoverable creep compliance (Jnr) and percentage of recovery (MSCR %R). The Jnr value indicates the rutting resistance of asphalt binders while MSCR %R represents the capability of binders to relax stresses and recover strains. While there is a consensus among the pavement community that the MSCR test parameters can be used effectively for specification of modified binders, it disregards asphalt binders that have relatively high non-recoverable compliance, Jnr, and states that those binders must be used without modification and the MSCR %R criteria must be waived. Interestingly, a wide variety of modified and current asphalt binders used in the state of Kansas (e.g., PG64S-XX and PG58-XX binders) does not satisfy the Jnr criteria and therefore are disregarded and not included in the specification system. There is a clear need to investigate how the MSCR and other DSR-based test parameters should be applied for grading and grade adjustment of these binders. This research proposal aims at development of clear guidelines on how to test and characterize modified PG64S-XX and current PG58-XX binders used in the state of Kansas.

    Project

    • Status: Active
    • Funding: $58,962
    • Sponsor Organizations:

      University of Kansas, Lawrence

      Department of Civil Engineering, 2006 Learned Hall
      Lawrence, KS  United States  66045-2225
    • Managing Organizations:

      Kansas Department of Transportation

      Eisenhower State Office Building
      700 SW Harrison Street
      Topeka, KS  United States  66603-3754
    • Project Managers:

      Heptig, Blair

    • Performing Organizations:

      University of Kansas, Lawrence

      Department of Civil Engineering, 2006 Learned Hall
      Lawrence, KS  United States  66045-2225
    • Principal Investigators:

      Darabi, Masoud

    • Start Date: 20170701
    • Expected Completion Date: 20190731
    • Actual Completion Date: 0

    Subject/Index Terms

    Filing Info

    • Accession Number: 01662454
    • Record Type: Research project
    • Source Agency: Kansas Department of Transportation
    • Files: RiP, STATEDOT
    • Created Date: Mar 8 2018 12:54PM